-ˌkäpyəˈlā.triks noun
Etymology: New Latin, from bursa + copulatrix of copulation, from Late Latin, she that unites, feminine of copulator he that unites, from Latin copulatus, past participle of copulare to bind, join, unite — more at copulate
1. : a pouch receiving spermatozoa during copulation (as in certain insects)
2. : a thin fan or bell-shaped expansion of the cuticle of the tail of many male nematode worms that functions as a clasper during copulation